Intelligence Agencies act on the behalf of their respective nations, there is nothing surprising about the US spying on the EU and vice versa.
As we already know the extent of the collection programmes the NSA operates i really do not see any real value in spewing more and more content about it, especially things that start to touch on the operational know-how of such programmes.
As much as we don't like the Americans spying on us there are far worse nations out there that i would actually fear if they will ever gain even a shred of the capabilities the NSA and some other western allied nations have.
Sadly this incident will be a very bad thing to whistleblowing in the long run, good luck passing any whistleblowing protection laws in the US (and many other countries including in the EU who took notice) any time soon.
While i do respect the sentiment behind Snowden's leak, I do actually have a bone to pick with how it was executed. There were NSA leakers before him, there will hopefully be some after him that will speak out when a line is crossed. However grabbing which ever documents you can put your hands on, and then seeking shelter in what is now a defacto hostile state isn't really responsible behavior.
Just few years before Snowden we already had an NSA leak from which the "secret interpretation of the FISA act" fiasco was made public. Snowden could've made the same effective impact with a handful of slides, not 1000's of documents (if not more, some numbers which were flying in the early days of the leak pointed at anywhere between 50 and 250 thousands documents) of which many probably contain actionable information which i would dare to say puts the EU as a organisation, and you as an individual at more risk than anything the NSA will ever did or do.